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Also I Didn't Mention This But Raph's Bandana Is Red Like The Hamato Clan And Donnie's Is Purple Which Is Similar To The Foot - Blog Posts
OK so lemme just—
I know this seems like a wild take but I stick by it. On the surface Raph and Shredder may seem very similar but I truly think Donnie has a bit more in common with him instead
The only thing Raph and Shredder have in common, to me at least, is rage.
Rage isn't all who Shredder is. Rage isn't all who Raph is either, but their anger is different. Raph's more emotional in his anger, more reactive. If someone pisses him off he shows how he feels immediately. He's not the type to bide his time and form a plan. He's also not a very good leader, as seen when he froze up in New Girl in Town.
But Shredder is.
He's cold and calculated in his plans even when blinded by rage and seeking revenge. He's extremely cunning and dedicated to his goals and will stop at nothing to achieve them, even if it involves taking the life of someone who's wronged him, no matter what anyone says or what he has to do.
So, does that remind you of anyone?
Out of all the turtles, Donnie, as far as I know, is the only one to have an arc that revolves around him trying to kill someone out of revenge for a past incident and having to be taught otherwise. Leo hasn't, Mikey hasn't, and Raph hasn't either. From what I know, it's only been Donnie.
And of course I can't talk about parallels without bringing up the love triangle between him, April and Casey.
It's obvious that Donnie doesn't like Casey at first, because he's jealous. Jealous because of his feelings for April and towards himself and how Casey manages to tear everything apart. He saw him as a love rival and feared for the day that April chooses Casey over him, so he lashed out.
Shredder was jealous because Tang Shen chose Splinter over him. He was consumed by his feelings and lashed out as well, although he had more fatal consequences.
Thankfully the love triangle never got to the point of murder obviously, but Donnie and Casey very much fought a lot because of their affection for April, just like Shredder, Splinter and Tang Shen.
Admittedly a lot of this is a reach and maybe a bit surface level but I've wrote enough and figured I should get this off my chest somehow °3°
I'm kinda in the mood for some 12! Donnie angst so I wanna get the ball rolling by mentioning how I think he has more similarities with the Shredder than Raph does :p